Ho

dehydroepiandrosterone

androstenedione testosterone androstenedione testosterone

CYP19 (aromatase)

estrone estradiol-17p

FIGURE 6 Biosynthesis of ovarian hormones. Cleavage of the cholesterol side chain by P450scc between carbons 21 and 22 gives rise to 21-carbon progestins. Removal of carbons 20 and 21 by the two-step reaction catalyzed by P450c17 (17a hydroxylase/lyase) produces the 19-carbon androgen series. Aromatization of ring A catalyzed by P450cyp19 (aromatase) eliminates carbon 19 and yields 18-carbon estrogens. 3pHSD, 3p hydroxyster-oid dehydrogenase; 17pHSD, 17p hydroxysteroid dehydrogenase.

CYP19 (aromatase)

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